Why Famous: Hans Christian Ørsted discovered electromagnetism while observing a compass needle in 1820. He investigated further and published his findings. For his work The Royal Society of London awarded him the Copley Medal.
The oersted, the centimetre-gram-second system (CGS) unit of magnetic induction is named after him.
Ørsted was also the first to formulate aluminium in 1825.
- 1820-04-21 Danish scientist Hans Christian Ørsted is the first to identify electromagnetism, when he observes a compass needle